Debian squeeze GDM3 Problem

[Houbey <houbey@arcor.de>]

Hello, i have this get this mail adress of Jonathan Wiltshire. I I have 
tried some assistance on the internet to change the gdm3 
login-background. After a restart debian the new .svg picture is just 
white. Or reverts back to standard. Maybe it is a bug or is wanted by 
debian way?

 I hope someone can answer me or help me?

 Friendly greetings
 Houbey